Bismuth layer-structured ferroelectrics with cation vacancies

被引：5
作者：
Noguchi, Y [1 ]
Miyayama, M [1 ]
机构：
[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
来源：
ASIAN CERAMIC SCIENCE FOR ELECTRONICS II AND ELECTROCERAMICS IN JAPAN V, PROCEEDINGS | 2002年 / 228-2卷
关键词：
BLSF; cation vacancies; Curie temperature; dielectric dispersion; ferroelectric; Rietveld analysis;
D O I：
10.4028/www.scientific.net/KEM.228-229.223
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of Bi and La substitution on the crystal structure and polarization properties of SrBi2Ta2O9 (SBT) were investigated. The Rietveld refinement of neutron powder diffraction demonstrated that Bi3+ and La3+ substitution preferentially at the Sr2+ site (perovskite A site) resulted in A-site vacancies for charge compensation. The substitution of Bi enhanced ferroelectric distortion of perovskite blocks, leading to a larger remanent polarization (P-r), while the incorporation of La led to a much lower coercive field (E-c) as well as a larger P-r than SBT. The presence of cation vacancies at A site facilitated a polarization switching, thus the larger P-r and lower E-c were obtained for La-substituted SBT.
引用
收藏
页码：223 / 226
页数：4
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